12+(-4) and i will give brainllest

Adepartment store purchases screen-printed t-shirts at a cost of $5 per shirt. they mark up the price 150% (making the selling price 250% of the store's purchase price) and put them on the sales floor. every month that a t-shirt doesn't sell, the store reduces the selling price by 25%.

What numbers are included in the set of integers? what numbers are not included?

Asinusoidal function whose frequency is 1/6pi